Comment # 4 on bug 95358 from Andy Furniss

Possible progress with the git aspect - while reading about reflog I saw a
comment which lead me to doing - 

git log --walk-reflogs origin/drm-next-4.7-wip-dal

which apparently gets me a sha for every time I did git fetch origin and dal
got updated.

Looks promising, but I haven't had time to test it out yet.